21534055302 has 16 divisors (see below), whose sum is σ = 44940637440. Its totient is φ = 6865930632.

The previous prime is 21534055273. The next prime is 21534055331. The reversal of 21534055302 is 20355043512.

It is an interprime number because it is at equal distance from previous prime (21534055273) and next prime (21534055331).

It is a super-2 number, since 2×21534055302² (a number of 21 digits) contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 21534055302.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 78021802 + ... + 78022077.

It is an arithmetic number, because the mean of its divisors is an integer number (2808789840).

Almost surely, 2^21534055302 is an apocalyptic number.

21534055302 is an abundant number, since it is smaller than the sum of its proper divisors (23406582138).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

21534055302 is a wasteful number, since it uses less digits than its factorization.

21534055302 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 156043907.

The product of its (nonzero) digits is 18000, while the sum is 30.

Adding to 21534055302 its reverse (20355043512), we get a palindrome (41889098814).

The spelling of 21534055302 in words is "twenty-one billion, five hundred thirty-four million, fifty-five thousand, three hundred two".